*You will need to create an account, it's not too hard and you gain access to tons of other effects.

And import it into Vegas, I'm going to align the end of it with the end of the first half of the video and click on the video of the second half and press U to unlink it with the audio, I'm then going to align the start of the second half with the start of the sound effect.

Then I'm going to go to Vegas' Transitions and go to Linear Wipe and pull it over to the end of the first video, you should get this window, you can adjust the angle if you want, feature is how soft the edge is, mess around with them if you please.

Now just align the start of the linear wipe with the start of the woosh effect.

Once you do that you should end up with something like the video above. If this helped you, considering clicking that like button beside quote. Have a nice day.

What's cool about Vegas (im using 11) is that you can really almost perfectly align the transition and choose how fast it goes by zooming into your tracks and working with your timeline. Watching your audio track for the sound waves can help a ton as well.